Method of manufacturing jointless facings of floors, walls, and the like.



UNITED STATES PATENT OFFICE.

LEONHARD PINK, OF BERLIN, GERMANY JOSEPH SIMSON, ATTORNEY IN FACT, ASSIGNQR TO SAID JOSEPH SIMSON, INDIVIDUALLY.

METHOD OF MANUFAC'IURING J'OINTLESS FACINGS OF FLOORS, WALLS, AND THE Patented Mar. 5, 1912.

LIKE.

1,019,083, Specification of Letters Patent.

No Drawing.

Application filed March 4, 1910. Serial-No. 547,201.

VValls, and the Like, of which the following is a specification.

The subject matter of this invention is an-improved process of manufacturing plastic flooring, the invention relating more particularly to the making of jointless facings for floor surfaces, walls, and the like.

As is well known, artificial plastic masses for flooring are usually rather porous and even the most dense plastic compositions remain highly hygroscopic, which condition renders the floor or wall covering formed therefrom liable to change with climatic conditions and become distorted'to such an extent as to crack and become otherwise impaired. For remedying this defect, by acting upon any unused magnesia it has been proposed to add various agents to the mass, but the mass thus obtained became hard too rapidly. It has also been proposed to add fats of various kinds for water-proofing.

The present invention is designed to overcome defects by adding to a mass composed of burned magnesite, magnesium chlorid lye and a filling agent, an inorganic acid and oleic acid and -I prefer that the inorgandic acid employed shall be phosphoric aci It has been found that oleic acid pene trates the pores of the filling material, displaces excess of chlorid and forms an agent of expansion. The agents, usually acids, proposed hitherto act to neutralize any magnesite or calcium-carbonate which ma be present in the magnesia. It has also been found that such carbonates, if present, cause movement in the sense of waves of expan-' sionthroughout the mass.

the gradual expansion of the mass and cracking of the surface. It has also been This movement found that phosphoric acid in the relation indicated is more eifective than any other inorganic acid. It forms calcic phosphate which drives the carbonic acid from the magnesium or calcium base allowing it to escape as such without causing the mass to swell or to shrink; it is also insoluble and finally has a poisonous or at least a deterrent efiect upon insects and bacilli. It is slightly hygroscopic and to overcome this ob ection, I prefer to incorporate in the mass a small quantity of oleic acid which latter fills the pores of the mass, effectually excluding moisture, and acts as a retarder duringthe setting; the oleic acid also imparts a degree of elasticity and flexibility. I prefer the oleic acid for this purpose to a fat for the reason that the latter, I have found, has a. tendency to saponify and the soap thus formed revents the formation of the phosphate indlcated while the glycerin therein is water-soluble and otherwise objectionable. Other fatty acids are inferior to oleic for various physical reasons, and the result is not as elastic and suitable for the purpose intended by this invention. These inorganic acids, therefore, kill any life or movement of this kind'in the magnesite to which the defects mentioned above are-attributable. The usual filling agents are mixed in.

I claim 1. The herein described method of manufacturing jointless facings for floors, Walls and the like, consisting in the mixing of magnesia, magnesium chlorid, a filling agent, oleic acid, and an inorganic acid, applying the mixture and shaping to form a facing for a floor or Wall.

2. The herein described method of manu-- LEONHARD PINK. Witnesses:

WOLDEMAR HAUPT,

HENRY HASPER. 

